The Experts below are selected from a list of 204 Experts worldwide ranked by ideXlab platform
Jacques Bovet - One of the best experts on this subject based on the ideXlab platform.
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Homing Behavior of Mice: Test of a “Randomness”‐Model
Zeitschrift für Tierpsychologie, 2010Co-Authors: Jacques BovetAbstract:The results of a field experiment on Homing Behavior in European woodmice (genus Apodemus) are used to test a model that explains Homing in small mammals released outside their familiar area as the result of rectilinear travel in directions that coincide with the home direction only by chance. They do not support one of the major assumptions of the model, and suggest that rectilinear travel is limited to directions that do not deviate much from the home direction. Zusammenfassung Das Heimfindevermogen von Gelbhals- und Waldmausen (Apodemus flavicollis und A. sylvaticus) wurde im Freiland experimentell untersucht. Fallen fur 244 auserhalb ihres gewohnlichen Lebensraumes freigelassene Mause wurden am Heimplatz und an verschiedenen anderen Stellen in “falschen” Richtungen aufgestellt. Die entfernungsabhangige Wiederfangrate an Heimplatzen ist deutlich groser als die in falschen Richtungen. Das widerlegt ein von Wilson und Findley (1972) und Furrer (1973) vorgeschlagenes “Zufalls”-Modell. Unsere Funde deuten daraufhin, das die Mause vom Auflasort ziemlich geradlinig heimwarts wandern, nicht aber gezielt in andere Richtungen.
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Homing Behavior of mice test of a randomness model
Ethology, 2010Co-Authors: Jacques BovetAbstract:The results of a field experiment on Homing Behavior in European woodmice (genus Apodemus) are used to test a model that explains Homing in small mammals released outside their familiar area as the result of rectilinear travel in directions that coincide with the home direction only by chance. They do not support one of the major assumptions of the model, and suggest that rectilinear travel is limited to directions that do not deviate much from the home direction. Zusammenfassung Das Heimfindevermogen von Gelbhals- und Waldmausen (Apodemus flavicollis und A. sylvaticus) wurde im Freiland experimentell untersucht. Fallen fur 244 auserhalb ihres gewohnlichen Lebensraumes freigelassene Mause wurden am Heimplatz und an verschiedenen anderen Stellen in “falschen” Richtungen aufgestellt. Die entfernungsabhangige Wiederfangrate an Heimplatzen ist deutlich groser als die in falschen Richtungen. Das widerlegt ein von Wilson und Findley (1972) und Furrer (1973) vorgeschlagenes “Zufalls”-Modell. Unsere Funde deuten daraufhin, das die Mause vom Auflasort ziemlich geradlinig heimwarts wandern, nicht aber gezielt in andere Richtungen.
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Route‐based Visual Information has Limited Effect on the Homing Performance of Red Squirrels, Tamiasciurus hudsonicus
Ethology, 2010Co-Authors: Jacques BovetAbstract:The role of route-based visual information in the Homing Behavior of red squirrels (Tamiasciurus hudsonicus) was assessed in an experiment contrasting the Homing performance of 8 squirrels that could see the landscape during displacement and that of 8 squirrels that could not. Availability of route-based visual information improves the accuracy of homeward orientation but is of no use for the animals to assess distance to home. These findings are congruent with the “critical-distance model” (Bovet 1984, 1987) which implies that choice of direction and estimation of distance are independent processes in the Homing performance of untrained animals.
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Computer-simulations of Rodent Homing Behavior, Using a Probabilistic Model
Journal of Theoretical Biology, 1993Co-Authors: Jacques Bovet, Pierre BovetAbstract:Abstract The recapture patterns observed in a Homing experiment with wild mice of the genus Apodemus could be simulated using a probabilistic model that includes a strategy of repeated searches around the release site, and two discrete motivational stages, but no specific directionality ("orientation") toward the home-target. As an average, however, model-mice traveled overall distances that were one order of magnitude larger than bee-line distances from release site to place of recapture. Whether real mice travel such distances while Homing should be tested in the field to validate or invalidate the model.
Tracy K. Collier - One of the best experts on this subject based on the ideXlab platform.
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone in - duced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha ). Nominal exposure concentrations (0.1, 1.0, and 10.0 mg·L -1 ) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesti- cide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 mg·L -1 . Similarly, Homing Behavior was impaired at 10.0 mg·L -1 . Our results suggest that olfactory-mediated Behaviors are sensitive to
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone induced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha). Nominal exposure concentrations (0.1, 1.0, and 10.0 µg·L-1) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesticide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 µg·L-1. Similarly, Homing Behavior was impaired at 10.0 µg·L-1. Our results suggest that olfactory-mediated Behaviors are sensitive to anticholinesterase neurotoxicity in salmonids and that short-term, sublethal exposures to these insecticides may cause significant Behavioral deficits. Such deficits may have negative consequences for survival and reproductive success in these fish.
Nathaniel L. Scholz - One of the best experts on this subject based on the ideXlab platform.
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone in - duced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha ). Nominal exposure concentrations (0.1, 1.0, and 10.0 mg·L -1 ) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesti- cide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 mg·L -1 . Similarly, Homing Behavior was impaired at 10.0 mg·L -1 . Our results suggest that olfactory-mediated Behaviors are sensitive to
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone induced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha). Nominal exposure concentrations (0.1, 1.0, and 10.0 µg·L-1) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesticide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 µg·L-1. Similarly, Homing Behavior was impaired at 10.0 µg·L-1. Our results suggest that olfactory-mediated Behaviors are sensitive to anticholinesterase neurotoxicity in salmonids and that short-term, sublethal exposures to these insecticides may cause significant Behavioral deficits. Such deficits may have negative consequences for survival and reproductive success in these fish.
Udo R Markert - One of the best experts on this subject based on the ideXlab platform.
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SHORT COMMUNICATION: Development of a Human Model to Study Homing Behavior of Immune Cells into Decidua and Placental Villi Under Ex Vivo Conditions
American Journal of Reproductive Immunology, 2008Co-Authors: Joana Heinzelmann, Lydia Seyfarth, Ekkehard Schleussner, Uta Enke, Antoine Malek, Udo R MarkertAbstract:Problem Homing of lymphocytes and NK cells into the decidua and its regulation has been very controversially discussed. Therefore, we aimed to establish an in vivo simulation method for analysis of Homing Behavior, which might be also useful for other cells such as stem or tumor cells. Method of study A human term placenta has been perfused with medium to elute blood and then with maternal autologous carboxyfluorescein succinimidyl ester (CFSE)-labeled peripheral blood lymphocytes for 3 hr and rinsed for another 2 hr. Tissue was analysed histologically for detection of labeled cells. Labeled lymphocytes and beads in perfusate have been identified and counted by flow cytometry. Results At the moment of tissue fixation for histology, the perfusate was free of labeled cells. Labeled perfused lymphocytes have been found adhered and integrated in vessel wall structures, in decidual stroma and as colonies in individual villi. Conclusion Placenta perfusion with a lymphocyte suspension is feasible without plugging the tube system. Time is sufficient for cells to adhere and to migrate into the stroma. Also some villi have been infiltrated which might be caused by inflammatory stimuli. The perfusion system might be useful to test substances for their capacity to influence Homing of lymphocytes or other cells.
Thomas P. Quinn - One of the best experts on this subject based on the ideXlab platform.
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone in - duced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha ). Nominal exposure concentrations (0.1, 1.0, and 10.0 mg·L -1 ) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesti- cide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 mg·L -1 . Similarly, Homing Behavior was impaired at 10.0 mg·L -1 . Our results suggest that olfactory-mediated Behaviors are sensitive to
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Diazinon disrupts antipredator and Homing Behaviors in chinook salmon (Oncorhynchus tshawytscha)
Canadian Journal of Fisheries and Aquatic Sciences, 2000Co-Authors: Nathaniel L. Scholz, Thomas P. Quinn, Nathan K. Truelove, Barbara L. French, Barry A. Berejikian, Edmundo Casillas, Tracy K. CollierAbstract:Neurotoxic pesticides are known to contaminate surface waters that provide habitat for salmonids, including some listed for protection under the U.S. Endangered Species Act. Despite their widespread use, the impacts of these pesticides on the neurological health of wild salmon are not well understood. Of particular concern are the organophosphate and carbamate insecticides that block synaptic transmission by inhibiting neuronal acetylcholinesterase. Here we assess the effects of diazinon, an organophosphate insecticide, on alarm pheromone induced antipredator responses and Homing Behavior in chinook salmon (Oncorhynchus tshawytscha). Nominal exposure concentrations (0.1, 1.0, and 10.0 µg·L-1) were chosen to emulate diazinon pulses in the natural environment. In the antipredator study, diazinon had no effect on swimming Behavior or visually guided food capture. However, the pesticide significantly inhibited olfactory-mediated alarm responses at concentrations as low as 1.0 µg·L-1. Similarly, Homing Behavior was impaired at 10.0 µg·L-1. Our results suggest that olfactory-mediated Behaviors are sensitive to anticholinesterase neurotoxicity in salmonids and that short-term, sublethal exposures to these insecticides may cause significant Behavioral deficits. Such deficits may have negative consequences for survival and reproductive success in these fish.